How to register multiple implementations of the same interface in Asp.Net Core?

Question

I have services that are derived from the same interface.

public interface IService { }
public class ServiceA : IService { }
public class ServiceB : IService         


        

Answer 1

My solution for what it's worth... considered switching to Castle Windsor as can't say I liked any of the solutions above. Sorry!!

public interface IStage : IStage { }

public interface IStage {
      void DoSomething();
}

Create your various implementations

public class YourClassA : IStage { 
    public void DoSomething() 
    {
        ...TODO
    }
}

public class YourClassB : IStage { .....etc. }

Registration

services.AddTransient, YourClassA>()
services.AddTransient, YourClassB>()

Constructor and instance usage...

public class Whatever
{
   private IStage ClassA { get; }

   public Whatever(IStage yourClassA)
   {
         ClassA = yourClassA;
   }

   public void SomeWhateverMethod()
   {
        ClassA.DoSomething();
        .....
   }